High-speed steel free from tungsten



Patented Mar. 13,1923;

WALTER LOTHAR EDUARD EILENDER, or 'RinvtscHEID, GERMANY, AssrGnoR, BY

MESNE nssremnnrs; DELAWARE.

Ho Drawing.

To all whomit may concern: I

Be it known that I, WALTER LorrHA'R EDUARD EILENDER, a subject of the German Emperor, and residing at Remscheid, Germany, have invented certain new and useful Improvements from- Tungsten, specification. I

It is known, that highspeed steels comprise chronic tungsten-steels'with such a content of carbon, that-the necessary and sufiicient hardness can be obtained.-

The content of chromium varies between 3 to 7 p. c. that of tungsten-was gradually increased, so that, at the present time the best qualities contain between 18 and 25 p. c. It is known, that successful experiments of whlch the following-is'a have been made to further increase the cut-. addition of other metals,

ting capacity by 20 for instance molybdenum, vanadium and cobalt. v

I have for some time experimented for the purpose of producing a high speed steel of highest cutting effect without tungsten.

of the'following composition has a cutting capacity equal, at least, to the best makes of It is known that vanadium improves more or less nearly all alloy-steels. It therefore" low' additions down is obvious, that even improve the above to 0.15 p. c. comparatively in High-Speed Steel Free therefore also new.

These experimentsfhave shown that steel TO THE CHEMICAL rounna'rron, "I1 Ic.,:A CORPORATION or men-swarm srnnr. ram rnom rtrives'rnn.

Application am March 6,1917. Serial No. 152,725.

described tungstenless steel. ,It is. not less,

evident, that when small quantities of vanadium are used, a small amount of cobalt is 1 required, as that metal shows its effect mainly in conjunction with vanadium.

It has been proposed and is therefore known, to add cobalt to known chromium-. tungsten-vanadium-m0lybdenum highspeed The-above described highspeed steel steels. without'tungsten' is new and unknown up to date. The addition of cobalt to it is The steel may be produced by melting,

in crucibles, bar steel containing the required content of vanadium, and adding thereto the requisite amount of the metals molybdenum and chromium, viz, 6 to 10 per cent molybdenum and 3 to -6 per cent cl'iromium, and after proper fusion the fused metal is poured from the crucible into suitable ingot molds, from which it is obtained in the form of ingots.

.5 to 3.5 of the metal cobalt may-be added where the content of vanadium is low, as,

to secure by Letfor example, '.15 per cent.

What I claim and desire ters Patent as my invention is:

The herein described steel alloy for high- -speed steel of highest cutting capacity,

containing besides iron also 0.5-0.8 p, c. C, 6.010.0 p. 0. Mo, 3.06.0 p. 0. Cr, 0.2-

0.4. p. 0, Mn, 0.2-0.4. p. s1 and 015-2 p.- c. Va. I

In testimon whereof I hereunto aflix my signature in t e presence of two witnesses.

- WAL ER LOTHAR EDUARD' EILENDER. 

